Number of Segments Points/Seg~nent
8
2501
15
2001
31
i001
62
497
125
241
250 I01
SEQUENCE TRIGGER MODE
NUMBER OF SEGMENTS VS. RECORD LENGTH (TIME BASE: 20 usec)
Table 5.2
Neither the CHAN 1 nor CHAN 2 display is updated when the 9400A is
in the SINGLE or SEQNCE trigger mode, i.e. when no further data
are acquired. Vertical positioning of the displayed trace may
nevertheless be modified via the OFFSET control (32). The VAR
vernier (28) also remains active. However, no other parameter
modifications, such as vertical sensitivity or time changes, will
alter the display of a currently acquired waveform in CHAN 1 or
CHAN 2.
Of course, all parameters may be modified during this time by
manipulating the appropriate front panel controls, but such
modification - indicated by parameter changes in the Abridged
Front Panel Status field (IV) - will only be used when acquiring
the next trace.
Whenever the 9400A is in the NORM or AUTO trigger mode, data are
continuously acquired and the display rapidly updated. All
modifications in acquisition parameters are thus followed quickly
by subsequent waveform acquisition which results in their
appearing to the user as changes to the CHAN 1 or CHAN 2 display.
TRIG’D and READY LEDs (31) - The TRIG’D LED indicates Whenever the
digitizing has stopped (normally after a valid trigger). The READY LED
indicates that the trigger circuit has been armed and the 9400A is
currently digitizing input signals. Upon receiving a valid trigger
signal, it will continue digitization until the trigger conditions have
been satisfied and will then display the acquired waveform.
DELAY (34) - Adjusts the degree of pre- or post-trigger delay when
recording signals in the acquisition memories. Delay operation is via a
single continuously rotating knob. Turning this knob slowly allows
minute adjustment of the trigger point; turning it quickly results in
rapid trigger point movement. The DELAY control enables pre-trigger
adjustment, displayed in %. Pre-trigger adjustment up to 100% full
scale, and post-trigger adjustment up to i0,000 divisions in 0.02
division increments are available.
Manual Operation
5-11
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